They don't give a name in the option for small tournament.
It's labeled under esport cs go>>live bet test. All the way at the bottom.
For bigger tournament like cyber league or esl etc it has proper name and you can even bet round by round.
Here they took it down after a few round into map 3.
Edit: gyazo.com/a1445ab487bb05bea2b9546383b358..
It was just one rank above cyber.

It's not there anymore but look it was just above the cyber leage i listed.
It might pop up after some rounds into the next game or just before it starts, i will screen as soon as it appears and message you.
I use the normal layout not mobile one.

You can't bet something like 1 dollar on pinnacle, i don't think something that small is allowed ^^.
Around 140 on that one. I have a live bet on sk vs gambit now where i will 90 or 100 depending who win.
That anti eco secured my bet at round 2 already ^^.